https://wccftech.com/monster-hunter-rise-pc-patch-3-6-1-1/

A new Monster Hunter Rise PC patch is now live, addressing a critical issue that prevented multiple users from even starting the game.

Patch 3.6.1.1 addresses the boot saving issues that made the game fail to complete a proper save, preventing it from starting. Capcom also provided instructions for those who have experienced the issue before the patch's release.